Wireless receiver



2Q, R949 A. MQQLE WIRELESS RECEIVER Filed April 17, 1945 2 sheets-sneet 1 'YH m ff; f 'im' f 41 20 1949 A. NICOLE WIRELESS RECEIVER A 2 Sheets-Sheet 2 Filed April 17, 1945 DUDDDDU UUE DEUD DDU DDD DUE DDD M m f y w Patented Dec. 20, 1949 WIRELESS RECEIVER Amde Nicole, Stef-Croix, Switzerland, assigner, by mesne assignments,l to Hermann Thorens S. A., a corporation oL-Switzerland Application April 17, 1945, Serial No. 588,764 In Switzerland July 21, 1944 (ci. 25o- 14) 2 Claims.

There are available a multitude of receivers for broadcast radio-waves. They include generally a chassis, carrying the members of the various amplifier-circuits, a dial and a loudspeaker, the whole mounted in a housing or in a cabinet of wood. Considering the dimensions of the loudspeaker, which it is necessary to provide for obtaining good musical reproduction, this housing or cabinet has of necessity relatively great dimensions. As a consequence thereof, the designers have a tendency to give this housing the shape of a more or less ornamented piece of furniture. In fact however, these receivers require a considerable space and it would therefore seem desirable to decrease their dimensions without prejudice to the quality of the reproduction of the receiver.

AThe loudspeaker being furthermore placed of necessity-at a near distance from the tuningcircuits, there takes place a reaction between the loudspeaker and these circuits, reaction which produces a coupling eiect called acoustic coupling. This coupling effect makes it impossible to utilize fully the power of amplification of the amplifier.

The object of the present invention is a receiver for broadcast-waves, which consists of a dial and at least a part of the amplifying circuits necessary for feeding the loudspeaker, such an arrangement reducing the inconveniences mentioned, by the fact, that at least the part of the receiver carrying the tuning-circuits is separated from the loudspeaker and that all essential parts of the amplifier-circuits of the said part of the receiver are located in the same plane parallel to any one of the generating straight lines in the surface-plane of the dial.

I'I'he drawing attached shows schematically and as a matter of example two forms of execution of the receiver.

Fig. 1 is a perspective view of the receiver.

Fig. 2 shows a longitudinal cross-section along plane II-II of Figure 3.

Fig. 3 is a side View and Fig. 4 a cross-section in the plane IV-IV of the Figure 2.

In the form of execution as shown in Figures 1 to 4, the receiver comprises, as is the case in most of todays receivers, a mixing tube 1, a medium-frequency tube 8, a low-frequency preamplication tube 9 and an output-tube I0.

The receiver has the shape of a parallelepipedon, one face of which contains the dial I. This dial is enclosed by a frame 2, the dimensions of which determine two of the dimensions of the parallelepipedon. The third dimension of the latter is small compared with the two rst mentioned and corresponds approximately to the necting the receiver to the loudspeaker and to` the supply-system.

Figures 2 and 3 show the disposition of the essential circuits of the receiver, viz. the electronic tubes 1, 8, 9, I0, the variable condensers I I, the tuning coils I2, the coils of the oscillatorcircuit I3 and the coupling-transformers I5. All

of these organs are arranged side by side in the `same plane I5, parallel to the plane of the dial I and occupy approximately half of the volume of the parallelepipedon. The other half of this volume is taken up by the mechanical transmission members connecting the knobs with the members of the oscillating-circuits, for selection at will the desired station, and further by the -'resistances, by condensers, by connections and by other small members of fixed characteristics,

necessary for the good functioning of the receiver.

lKnob 3 controls simultaneously the two commutator-switches I 'I and I8, one of which cuts in or out the different sections of the tuning coils I 2, whereas the other switch controls the cutting in or out of the various sections of the coils I3 of the oscillator-circuit. By means of a cable I9 passing over small pulleys 20, the knob 4 controls the displacements of the variable condenser II and of an index-pointer ZI, travelling along the graduated scales on the dial I. The knob 5 operates a commutator-switch, for modi- 4fying the characteristic frequency-curve of the low frequency stages. It permits thus of choos ing and :Fixing the tonality of the receiver. Lastly, the knob 6 controls a device 22, for choosing l and xing the 4output-volume desired.

knob permits also of cutting in or off of the supply-system of the receiver.

As will be noted, the overall-dimensions of the receiver described above are much smaller than the ones of the chassis of a receiver of the same output and of a known type. The receiver described does not require any luxurious and expensive housing, since one of its faces is entirely or nearly entirely occupied by the dial. As a matter of fact, the dimensions of the front-face of the parailelepipedon are determined by the dimen- From the rear-face This sions of the dial. viz. by the precision of readability and regulation desired. The small d1- mensions of the receiver permit it to be incorporated for example in a table or another piece of furniture. It may also be simply placed on a table and maintained in a slightly inclined position by atsuitablefzsupport. It mayra'lso be very easily transported from'one place to another.-

The loudspeaker, the dimensions of which cannot be reduced if quality reception should be! conserved, may be placed at a hidden place as for example in a cupboard or behind a panelling:

In such a case, baiiles or a resonance-b'ox-fmay bef provided in order to profit ofrra'llzthe qualities' of; the loudspeaker and receiver, a condition Which-'.- it is not possible to obtain with receivers oftheactual design and which combine receiver andi loudspeaker in the same housing. Since the loudspeaker is at great distance from the tuning cir-- cuits of the receiver, there cannot possibly occur any` reaction betweenwthe same and for this reason, nofacoustic coupling isto be feared, evenv when-tuning-the circuits very closely to their points of resonance, in order to takefadvantage ofi all:theamplifyingV power: of 'the set.

Itris` evident, that thereceiver described above may; have; diierent' forms of execution. It is particularlyfpossible'- to'. add or to` omit other amplierestages; It4 isV alsoV evident, that the superheterodynef: receiver described above asv a matter of example, may be replacedfby any other:v

type; of: receiver: Lastly,r if it is desired tolstill more` reduce, the. overall-dimensions to a minimum, there may^ be mountedY behind the dial. onlyA 'themigh-frequency' and' medium-frequency stage or stages; .which are equipped with tuningcircuits. Thevlowefrequency stage orstages and .therectier may be placed in .a.housing, near the loudspeaker.

For principal reasons, the*y rectier, which is` a relatively heavy piece of apparatus; due to thev large volumeofiron of its transformenshould of preference not, be incorporated in the receiver; butishouldf beaplaced somewhere outside, as for example nearthe loudspeaker or any l'other-place desired; However,v in the `case of there being employed electronic tubes, supplied directly with the voltage oi the supply-system, the rectiermay alsonbie mounted. behindv the'rdial, inside of the housing. enclosing the receiver.

1 toc-.4,1 the-members of thefamplier-circuits are mounted on: a chassislll, which in turn is Xed by any;A known: meansY to` either` the dialv or to thewalls;oftheparallelepipedon; As an alternative' formloffexecu-tion, itiwouldhowever be possibletdomitithe chassis an-dto Xf-these organs directly" to;cither: th'eadi'alorfitsaframe, or tothe Walls-ofy thelparallelepipedon;

t;is;evident, thatthe dial may-be arranged in` diierent manners, with respect to the'amplierV stages, provided.A that the essential members oi? theamplierfstages near: the dial'be located in*` enea-plane: and: thatrthis plane be parallel vto any one of ithefstraight lines "contained in the 'surface 1 of the said dial.

Iclaim:`

3.-.- `A radio-:broadcast receiver for'feeding-a re=- motely locatedloudspeaker comprisingl a` parallel` wall thereof, a plurality of electronic tubes' mounted in alignment with their axes lying in a plane spaced from but parallel to said dial, a plurality of elements including transformers, condensers, variable condensers, tuning coils and oscillator coils in the plane of said electronic tubes, plurality. ofi adjustingJ devices positioned in proximity to saidY elementsM andl having movable elements, the movable elements of said variable lllf'con'densers, tuning coils and adjusting devices having axes of rotation or translation lying substantially in said plane, and control members coupled tor said movable elements and projecting i 'through endwalls oflsaicl cabinet, all of said elel''f'mentsand-'adjusting' devices having a thickness Insthe: vfor'rnof execution as shown in' Figures'v epipedonzcabinet 'having a .dial formingf one-- sider- 7 approximating the diameter of said tubes, and the distance between the dial and the opposite wall of said cabinet being substantially equal -to the externaldiameter oi oneof said electronic tubes.

2. A radio broadcast receiver for feeding a remotely'locatedloudspeaker comprising a parallelepipedon cabinet having longnarrow top andE bottomwalls, longhigh front and rea-r'Walls eachr` v having an area considerably greater than that ofthe other Walls and cooperating end'walls; said frcntiwall being formed substantially entirelyof a dial, apluraiity of electronic tubes" mounted in` alignment' with their axeslying in a plane spaced` from but parallel lto, said dial, a plurality of'ele-A ments including transformers, .condensers, vari-- able condensers, tuningcoils and oscillator coils inthe Vplaneloi said electronictubes, a pluralityof.l

adjusting devices positionedfinproximity to said-A ,elements-v andv having movable. elements,A thel movable elements ofV saidl variable, condenser-sf tuning coils andadjusting devicesfhaving axes.

of rotation orl translation lying, substantiallyin said plane, andfcontrol memberscoupled tosaid..`

movable,v elements andY projecting, through end wallsof said cabinet, all of said'` elements4 and:l adjusting, devices having; a thickness approxi-v matin-g .the diameter: of said: tubes', and' the dis tance between the" dial.` andthe opposite wall of 'said cabinet being substantially equalY to` the;

externalfdiameterfof one ofisaidelectroniditubes.

v A; NCOLE'.

REFERENCES CITED Ther following references are ofrecordin the l'e ofY thispatent: 

